Abstract : Brownfields consist of land and/or buildings that are abandoned or underutilized where expansion or redevelopment is complicated, in part, because of the threat of known or potential contamination. Federal and state laws governing the treatment of these sites may require remediation (cleanup) of property before redevelopment and can contribute to uncertain liability for property owners or users. As a result of these and other factors, redevelopment and reuse of these sites can be hindered. Redevelopment of brownfield sites is a particular problem in many central cities and inner suburbs of U.S. metropolitan areas that need to create jobs and attract commercial and industrial development. Because of this, a number of states and cities have developed programs to facilitate assessment, cleanup, and redevelopment of brownfields.